Light-sensitive material package

Abstract

A light-sensitive material package includes a light-shielding envelope containing a stack of sheet-form light-sensitive material, the light-shielding envelope having heat-seal parts on four edges. The light-sensitive material package further includes a cushioning member, which holds down all or a part of the heat-seal parts. The light-sensitive material package further includes a fitting-type box for storing the envelope, the fitting-type box being formed from an inner box and a lid. The stiffness of the heat-seal parts is at least 0.05 N.cm.

What is claimed is:  
     
       1. A light-sensitive material package comprising: 
       a fitting-type box comprising an inner box and a lid;  
       a light-shielding envelope containing a stack of sheet-form light-sensitive material, the light-shielding envelope having heat-seal parts on four edges and being stored in the fitting-type box; and  
       a cushioning member for holding down all or a part of the heat-seal parts;  
       wherein the stiffness of the heat-seal parts is at least 0.05 N·cm.  
     
     
       2. The light-sensitive material package according to  claim 1  wherein the weight of the stack of light-sensitive material is 3 kg or above. 
     
     
       3. The light-sensitive material package according to  claim 1  wherein the light-sensitive material has a support with a thickness of 170 μm to 200 μm. 
     
     
       4. The light-sensitive material package according to  claim 1  wherein the stack of light-sensitive material is packaged with a protecting sheet formed from a polypropylene sheet, and stored in the envelope, the stack of light-sensitive material being in direct contact with the protecting sheet. 
     
     
       5. The light-sensitive material package according to  claim 1  wherein the stiffness of an inner packaging material used for the envelope is at least 0.01 N·cm. 
     
     
       6. The light-sensitive material package according to  claim 1  wherein the tear strength of an inner packaging material used for the envelope is at least 1.5 N·cm. 
     
     
       7. The light-sensitive material package according to  claim 1  wherein the pressure within the envelope is 10 to 500 mm·H 2 O. 
     
     
       8. The light-sensitive material package according to  claim 1  wherein the cushioning member is disposed below the heat seal parts of the envelope stored in the inner box. 
     
     
       9. The light-sensitive material package according to  claim 1  wherein the width over which the cushioning member holds down all or a part of the heat-seal parts is 2 to 10 mm. 
     
     
       10. The light-sensitive material package according to  claim 1  wherein, when the cushioning member is enclosed below the heat-seal parts, in the case where the depth of the fitting-type box is 20 mm the height that the heat-seal parts are to be pushed down between the cushioning member and the lid of the fitting-type box is 1 to 5 mm before the lid is applied. 
     
     
       11. The light-sensitive material package according to  claim 1  wherein the body and the lid of the fitting-type box are fixed by pressure-sensitive tape. 
     
     
       12. The light-sensitive material package according to  claim 1  wherein the cushioning member is a foam formed by adding a foaming agent to a polyethylene resin, a polypropylene resin, a polyolefin resin, an ethylene copolymer resin, a copolymer resin having propylene as a main component, a polyolefin cross-linked resin, a polyamide resin, a mixed resin of one or two or more of said resins, a polyurethane, a natural rubber, or a synthetic rubber. 
     
     
       13. The light-sensitive material package according to  claim 1  wherein the fitting-type box is formed from a paperboard, a thermoplastic resin layer being laminated on the front and back sides of the paperboard. 
     
     
       14. The light-sensitive material package according to  claim 13  wherein the thermoplastic resin layer is a layer comprising a polyolefin. 
     
     
       15. The light-sensitive material package according to  claim 13  wherein the thickness of the thermoplastic resin layer is 10 μm to 200 μm. 
     
     
       16. The light-sensitive material package according to  claim 13  wherein the sheet-form light-sensitive material is light-sensitive material for forming an image having a line width of 500 μm or below. 
     
     
       17. The light-sensitive material package according to  claim 1  wherein all the front, back, and cross section of the paperboard forming the inner box and the lid of the fitting-type box are covered with a plastic. 
     
     
       18. The light-sensitive material package according to  claim 17  wherein the paperboard is covered with a thermoplastic resin film to which an antistatic agent has been added. 
     
     
       19. The light-sensitive material package according to  claim 18  wherein the antistatic agent is a nonionic surfactant.